TCP/IP (Parallel Library) Migration Guide

Migration Considerations

HP NonStop TCP/IP (Parallel Library) Migration Guide—522272-003

3-4

Error Treatment

An application programmatic interface (API) difference in Parallel Library TCP/IP

involves the EADDRINUSE error message. Parallel Library TCP/IP architecture might

allow a bind to fail with EADDRINUSE if a port is already in use. However, the bind

might complete without an error, although the error is returned on the next socket

request after the bind.

Applications using pre-D30 socket library are not compatible with library TCP/IP and

will receive the error FEDIALECTUNSUPPORTED.

Applications on a different system (remote socket requests) cannot use the Parallel

Library TCP/IP environment and will receive the error FEREQUESTUNSUPPORTED.

For fault-tolerant socket applications, if the application primary process fails, the

backup application receives an ECONNRESET error upon its first socket request after

takeover.

Fault-Tolerant Behavior

Most fault-tolerant behavior differences relate to TCPSAM. Those differences are

described in Section 2, The New Socket Provider. Two additional considerations

concerning fault-tolerant behavior are:

•

Differences in Applications Expecting ECONNRESET

Note that in the failure conditions listed in Table 2-1 on page 2-4, the application no

longer receives an ECONNRESET error. Hence, any application that monitors the

failure of the conventional TCP/IP primary processor and takes recovery action

based on receiving an ECONNRESET error might behave differently when the

TCPSAM primary processor fails. To avoid differences in application behavior in

this failure condition, start the application in the same processor as the TCPSAM

primary process.

•

Differences in Failure Information Reporting

As in conventional TCP/IP, in Parallel Library TCP/IP, if the TCPMON or TCPSAM

process detects a failure condition, TCPMON or TCPSAM dials out the failure

information to the Global Customer Support Center (GCSC) using HP Tandem

ASSOCIATESUB No such attribute No default

MAX-EPHEMERAL-PORT No such attribute Default 65024

RESERVEDIP No such attribute No default

TRACE SUBNET

Command Attribute Conventional TCP/IP Parallel Library TCP/IP

BULKIO | NOBULKIO No such attribute Default BULKIO

ALTER SUBNET Command

Attribute Conventional TCP/IP Parallel Library TCP/IP